#ifndef GOOGLE_PROTOBUF_HPB_INTERNAL_INTERNAL_H__
#define GOOGLE_PROTOBUF_HPB_INTERNAL_INTERNAL_H__

#include <cstdint>
#include <utility>

#include "upb/mem/arena.h"
#include "upb/message/message.h"

namespace hpb::internal {

struct PrivateAccess {
  template <typename T>
  static auto* GetInternalMsg(T&& message) {
    return message->msg();
  }
  template <typename T>
  static auto Proxy(upb_Message* p, upb_Arena* arena) {
    return typename T::Proxy(p, arena);
  }
  template <typename T>
  static auto CProxy(const upb_Message* p, upb_Arena* arena) {
    return typename T::CProxy(p, arena);
  }
  template <typename T>
  static auto CreateMessage(upb_Arena* arena) {
    return typename T::Proxy(upb_Message_New(T::minitable(), arena), arena);
  }

  template <typename ExtensionId>
  static constexpr uint32_t GetExtensionNumber(const ExtensionId& id) {
    return id.number();
  }
};

template <typename T>
auto* GetInternalMsg(T&& message) {
  return PrivateAccess::GetInternalMsg(std::forward<T>(message));
}

template <typename T>
typename T::Proxy CreateMessageProxy(upb_Message* msg, upb_Arena* arena) {
  return typename T::Proxy(msg, arena);
}

}  // namespace hpb::internal

#endif  // GOOGLE_PROTOBUF_HPB_INTERNAL_INTERNAL_H__